addinput method

eu.heili/LogicGate.java

@@ -1,5 +1,4 @@
 import java.util.ArrayList;
-import java.util.Arrays;
 
 public abstract class LogicGate {
     private final ArrayList<DigitalInput> inputs = new ArrayList<>();
@@ -31,4 +30,8 @@ public abstract class LogicGate {
     public int getInputNumber() {
         return inputs.size();
     }
+
+    public void addInput(DigitalInput in){
+        inputs.add(in);
+    }
 }